Understanding the movement of threatened species is important if we are to optimize management and conservation actions. Here, we describe the age and sex specific spatial and temporal ranging patterns of 19 bearded vultures Gypaetus barbatus tracked with GPS technology. Our findings suggest that spatial asymmetries are a consequence of breeding status and age-classes. Territorial individuals e...

Commercial trade of wild birds may devastate wild bird populations. Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) controls the trade of wild species listed in its appendices to avoid these species being threatened by international trade. China used to be one of the major trading countries with significant bird trade with foreign countries; on the other ...

This study aimed to compare the diversity of birds between protected and non–protected areas that are similar in climatic geographical features. The was carried out three different habitat types (Forest, Agricultural land Wetland Sundarijal Non-protected Changunarayan. Field data were collected using a “Point Count Approach” transects which laid & Wetland). Shannon-Wiener Margalef Diversity...

the purpose of this study was to estimate relative potential hazards to birds and bats from wind developments in texas. we compiled lists of rare, threatened, or endangered species, along with their respective ranges in texas. using a geographic information system (gis), we calculated a potential hazard index (phi) for 31 bird and ten bat species based upon the percentage of known or observed s...

Collar et al. (1994) estimate that of the 9672 extant species of bird, 1111 are threatened by extinction. Here, we test whether these threatened species are simply a random sample of birds, or whether there is something about their biology that predisposes them to extinction. We ask three specific questions. First, is extinction risk randomly distributed among families? Second, which families, ...

Global biodiversity loss is disproportionately rapid on islands, where invasive species are a major driver of extinctions. To inform conservation planning aimed at preventing extinctions, we identify the distribution and biogeographic patterns of highly threatened terrestrial vertebrates (classified by the International Union for Conservation of Nature) and invasive vertebrates on ~465,000 isla...

Unambiguous identification of the sex of live birds is critical in numerous areas of avian research, including studies of alternative reproductive tactics, sexratio manipulation, and conservation biology (e.g. van Rhijn 1973, Snyder and Snyder 1989, Stamps 1990). However, identification of sex can be problematic for researchers dealing with young birds or sexually monomorphic species. Technique...